Netplan why the network through the bridge does not work?

Question

ubuntu

Ubuntu Bionic.
I configure netplan in this way:

All IPs are registered, but nothing works, pings do not go anywhere.
Moreover, if you configure the interface directly, without a bridge, then everything works fine.
Again potteringD scold?

Answer 1

Since I tested in the Virtualbox virtual machine, apparently the bridge somehow did not want to work on the virtual network card, but on the real server everything works fine with the config above.